基于暂态过程优化的谐振式光纤陀螺背向散射噪声抑制方法研究

Research on the Method for Suppressing Backscatter Noise of Resonant Fiber Optic Gyro Based on Transient Process Optimization

摘要:

针对谐振式光纤陀螺受背向散射噪声影响严重的问题,对比分析了正弦波调制解调和三角波调制解调两种方案,并提出了一种基于暂态过程优化的噪声抑制方法。该方法通过部分采样和均值滤波,在不改变陀螺光、电硬件的前提下,优化了三角波调制时存在的暂态过程现象,提高背向散射噪声的抑制比,改善解调曲线工作区的线性度。搭建样机并进行实验后,结果表明,基于暂态过程优化的噪声抑制方法能将暂态过程的占空比由64.3%降低至12.1%,解调后背向散射噪声的抑制比达到46.8%,且解调曲线工作区线性度良好。可见,基于暂态过程优化的方法能有效提高谐振式光纤陀螺背向散射噪声的抑制能力,并改善解调曲线工作区线性度。

Abstract:

Two schemes of sine and triangular wave modulation and demodulation are compared and analyzed, while a method of suppressing backscatter noise based on transient process optimization is proposed to address the problem that resonant fiber optic gyro (RFOG) is seriously affected by backscatter noise. The method optimizes the phenomenon of transient process present in triangular wave modulation by partial sampling and mean filtering to improve rejection ratio of backscatter noise and the linearity of the workspace of the demodulation curve without changing optical and electrical hardware of the gyro. After building the prototype and conducting experiments, the results show that the noise suppression method based on transient process optimization can reduce the duty cycle of the transient process from 64.3% to 12.1%, and the suppression ratio of backscatter noise reaches 46.8%. At the same time, the workspace of the demodulation curve has a good linearity. It can be seen that the method based on transient process optimization is efficient to improve the ability of suppressing backscatter noise of RFOG and the linearity of the workspace of demodulation curve.